Jetted material diffusion member, surface treatment device, and surface treatment method

Abstract

To efficiently and uniformly perform surface treating on a treating target surface having a projection portion.SOLUTION: A jetted material diffusion member diffuses a jetted material and includes: a proximal end opening part to which the jetted material flows in; and a truncated cone shaped jig body including a distal end opening part facing a treating target surface having a diameter smaller than the proximal end opening part. An uneven part is formed in an inner surface of the jig body.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a jet diffusion member for diffusing a jet of material, a surface treatment device using the jet diffusion member, and a surface treatment method. [Background technology]

[0002] For example, when painting the walls of a structure, grinding work is carried out to remove foreign matter from the wall surface. There are various methods for grinding work, but generally, a blasting machine is used to grind the surface to be treated.

[0003] As disclosed in Patent Document 1, the blasting machine is equipped with a cup-shaped case whose opening is pressed against the surface to be treated, a nozzle that sprays abrasive material inside the case toward the surface to be treated, and a suction hose that sucks up the sprayed abrasive material and dust generated by the impact of the abrasive material on the surface to be treated. The grinding work of the surface to be treated is carried out by moving the case while pressing it against the surface to be treated. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-172295 Summary of the Invention [Problem to be solved by the invention]

[0005] The blasting machine described in Patent Document 1 is designed to collide abrasive material with the surface to be treated in a direction approximately perpendicular to the surface, so it is effective when the surface to be treated is relatively smooth. However, if the surface to be treated has protrusions or the like, it may not be possible to grind the sides and fine details with precision.

[0006] For example, in bridge repainting work, the surface to be treated may include steel joints in the bridge's main girders, counter beams, etc. Steel joints are generally constructed by placing a pair of splice plates across adjacent steel members, sandwiching them between them, and then bolting them together with the steel members.

[0007] As a result, protrusions appear on the surface of the joint due to the bolts and nuts, and simply hitting the abrasive material perpendicular to the surface of the joint with the steel material will not be able to accurately grind the sides and details of the protrusions. For this reason, the grinding process must be repeated many times with the blasting device case turned in various directions.

[0008] The task of changing the casing of the blasting device in various directions is cumbersome, and a blasting device with a case cannot handle the task of striking abrasives from the side against protrusions, etc. Therefore, an open blasting task is performed as a separate task, in which abrasives are struck against the surface to be treated without using a case. However, this increases the number of work steps and requires the task of collecting dust and other particles generated by striking abrasives against the surface to be treated, making the task more cumbersome.

[0009] The present invention has been made in view of the above-mentioned problems, and its main object is to efficiently and uniformly treat a surface to be treated that has protrusions. [Means for solving the problem]

[0010] In order to achieve this purpose, the jet diffusion member of the present invention is a jet diffusion member that diffuses jets, and is characterized in that it includes a truncated cone-shaped jig body that has a base end opening through which the jet flows and a tip end opening that faces the surface to be treated and has a smaller diameter than the base end opening, and that has an uneven portion formed on the inner surface of the jig body.

[0011] The jet diffusion member of the present invention is characterized in that the uneven portion is formed by providing a plurality of blade-shaped members extending from the base end opening to the tip end opening of the jig body.

[0012] The jet diffusing member of the present invention is characterized in that the jet is an abrasive material.

[0013] The surface treatment device of the present invention is a surface treatment device comprising a jet diffusion member of the present invention and a surface treatment mechanism that sprays a jet toward a surface to be treated, characterized in that the surface treatment mechanism includes an inner tube into which an injection nozzle that sprays the jet is inserted at the base end, and a nozzle head that covers the inner tube, and a jet diffusion member is removably provided at the tip end side of the inner tube facing the surface to be treated.

[0014] The surface treatment device of the present invention is characterized in that the surface treatment mechanism is a blasting device.

[0015] The surface treatment method of the present invention is characterized in that, with a protrusion portion positioned on the surface to be treated arranged on the inside of the spray diffusion member, the tip opening is abutted against the surface to be treated and the spray material is sprayed.

[0016] The surface treatment method of the present invention is characterized in that the abrasive is sprayed onto the surface to be treated while rotating the spray diffusion member about an axis on the surface to be treated.

[0017] According to the jet diffusion member of the present invention, the inner surface of the frustum-shaped jig body is formed into a tapered surface that tapers from the base end opening toward the tip end opening, and is formed with uneven portions. As a result, the jet flowing in from the base end opening of the jig body collides with the inner surface of the jig body and the uneven portions, thereby irregularly distorting the jet direction in various directions, such as from the direction toward the tip end opening to a direction intersecting or perpendicular to that, thereby diffusing the jet.

[0018] As a result, when there is a protrusion on the surface to be treated that the sprayed material will hit, by arranging this protrusion inside the jig body, the sprayed material will hit not only the top surface of the protrusion but also the side surface, allowing for efficient surface treatment. Furthermore, by rotating the sprayed material diffusing member around its axis with the protrusion arranged inside the jig body, the sprayed material can be evenly hit on the entire outer surface, including the side and fine parts of the protrusion, making it possible to form a higher quality finished surface on the surface to be treated after surface treatment.

[0019] Therefore, in surface preparation such as repainting work, when the surface to be treated includes protruding parts such as bolts and nuts, by using a surface treatment device with a blasting device that sprays abrasives and is equipped with a spray diffusion member, the abrasives can be made to hit the entire protruding parts of the bolts and nuts without changing the position of the surface treatment device.In addition, the work of separately performing open blasting work to hit the abrasives from the side can be omitted, which contributes to improving the workability and shortening the construction period of construction work including surface treatment work. [Effects of the Invention]

[0020] According to the present invention, the jig body into which the sprayed material flows is formed in a frustum shape, and uneven portions are formed on its inner surface, so that the spray direction of the sprayed material can be irregularly disturbed and diffused, making it possible to efficiently and uniformly treat surfaces that have protrusions. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a diagram showing a surface treatment device of the present invention; [Figure 2] 1 is a diagram showing a jet diffusion member of the present invention; [Figure 3] 1 is a diagram showing a state in which a jet impinges on a jet diffusion member of the present invention. [Figure 4] 1 is a diagram illustrating a surface treatment method of the present invention. [Figure 5] FIG. 2 is a diagram showing another example (part 1) of the jet diffusing member of the present invention. [Figure 6]FIG. 4 is a diagram showing another example (part 2) of the jet diffusing member of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0022] The present invention randomly scatters the spray direction of the spray material, causing it to collide with the entire outer surface, including the side surfaces of protrusions present on the surface to be treated. While there are no limitations on the surface to be treated, the protrusions present on the surface to be treated, the type of spray material, or the type of surface treatment, in this embodiment, the case of blasting a surface to be treated that has protrusions due to bolts and nuts will be taken as an example, and details of the spray material diffusion member, surface treatment device, and surface treatment method will be described with reference to Figures 1 to 6.

[0023] <<Surface Treatment Equipment>> As shown in FIG. 1( a ), the surface treatment device 100 is composed of a jet diffusion member 10 and a blasting device 50 .

[0024] <<Blasting Device>> The blasting device 50 is a device that sprays granular abrasive material M toward the surface F to be treated, causing the abrasive material M to collide with foreign matter on the surface F to be treated and remove it, and is equipped with a blast hose 60, a nozzle head 70, and a recovery hose 80.

[0025] 1(b), the blast hose 60 supplies the abrasive material M, which is transported together with compressed air, to an injection nozzle 61 attached to the tip, and the tip of the injection nozzle 61 is inserted into a nozzle head 70. The base end of the blast hose 60 is connected to a pressurized tank (not shown) in which the abrasive material M is stored.

[0026] The nozzle head 70 is, for example, a cone-shaped case having a tip side 71 facing the surface F to be treated in the direction in which the abrasive material M is sprayed from the spray nozzle 61, and a collection section 72 is provided near the tip side 71 for collecting the abrasive material M sprayed from the spray nozzle 61 and dust S including foreign matter peeled off and removed from the surface F to be treated by this abrasive material M.

[0027] Furthermore, a sealing material 73 is provided on the tip side 71 facing the surface F to be treated, to seal the gap with the surface F to be treated. The sealing material 73 is, for example, a brush, and prevents the abrasive material M sprayed from the spray nozzle 61 and dust S such as foreign matter removed by the abrasive material M from leaking out.

[0028] The nozzle head 70 is provided with an inner cylinder 74. The inner cylinder 74 has a cone shape similar to the nozzle head 70, and the injection nozzle 61 is inserted into a base end side 741 of the inner cylinder 74. A tip end side 742 of the inner cylinder 74 forms approximately the same plane as the tip end side 71 of the nozzle head 70.

[0029] Furthermore, a through-hole 743 is formed on the outer surface of the inner cylinder 74 at a position opposite to the collection section 72 provided on the nozzle head 70. Furthermore, a collection flow path 90 for collecting dust S is formed between the outer surface of the inner cylinder 74 and the inner wall surface of the nozzle head 70.

[0030] One end of recovery hose 80 is connected to recovery unit 72, and the other end is connected to a dust collector (not shown). By operating this dust collector, the aforementioned dust S generated inside nozzle head 70 can be sucked and recovered from recovery hose 80 connected to recovery unit 72 via through-hole 743 provided in inner cylinder 74 or via recovery flow path 90 from the gap between tip end side 742 of inner cylinder 74 and sealing material 73.

[0031] In the above-described blasting device 50, the abrasive M is sprayed from the spray nozzle 61 attached to the blast hose 60 in a straight line (approximately perpendicular to the surface F) toward the surface F to be treated. In this case, if there is a protrusion P such as a bolt or nut on the surface F to be treated, the abrasive M cannot collide with the side surface of the protrusion. Therefore, the blasting device 50 is equipped with a spray diffusion member 10.

[0032] <<<Jet diffusion material>>> As shown in Figures 1(b) and 2(a), the jet diffusion member 10 comprises a jig body 20 that is detachably attached to the tip side 742 of the inner tube 74 provided in the nozzle head 70, and a recovery port 30.

[0033] 2(a), the jig body 20 is a cylindrical body in the shape of a truncated cone, with the distal end opening 21 formed to have a smaller diameter than the proximal end opening 22, and the proximal end opening 22 attached to the distal end side 742 of the inner cylinder 74. Note that the attachment structure of the proximal end opening 22 to the distal end side 742 of the inner cylinder 74 may be any as long as it is detachable.

[0034] The side wall 23 is tapered from the base end opening 22 to the tip end opening 21, and its inner surface is provided with blade-shaped members 24, as shown in Figure 2(b). In addition, a recovery port 30 is provided on the tip end opening 21 side.

[0035] As shown in Figure 2(b), the blade-shaped members 24 are strip-shaped members extending from the base end opening 22 of the side wall 23 toward the tip end opening 21, with multiple members attached at intervals to the inner surface of the side wall 23. The cross-sectional shape and outer shape of the strip-shaped members may be any shape, but in Figure 2(b), the cross section is rectangular and the outer shape is gently curved. There are also no limitations on the material of the blade-shaped members 24, but a hard material such as steel is preferred so that the abrasive material M bounces off efficiently when it collides with it.

[0036] The recovery port 30 is a notch provided on the tip opening 21 side of the side wall 23, and is a communication portion for connecting the internal space of the jig body 20 to the space surrounded by the jig body 20 and the sealing material 73, as shown in Figure 1(a).

[0037] 2(a) and 2(b) show an example in which a plurality of recovery ports 30 are provided at intervals in the circumferential direction of the tip opening 21. As shown in FIG. 1(b), the abrasive M sprayed from the spray nozzle 61 and dust S such as foreign matter removed by the abrasive M are sucked and collected by a recovery hose 80 from the recovery port 30 through a recovery flow path 90.

[0038] 3, when abrasive material M flows into the base end opening 22 of the jig body 20, it collides with the inner surface of the side wall 23 and the blade-like members 24 of the above-mentioned jet diffusion member 10. This irregularly changes the jet direction of the abrasive material M from the direction toward the surface F to be treated at the tip opening 21 to a direction intersecting or perpendicular to this direction, thereby diffusing the abrasive material M.

[0039] <Surface treatment method using surface treatment device> The procedure for surface treating the treatment target surface F including the protrusions P using the surface treatment device 100 in which the jet diffusion member 10 having the above-described configuration is attached to the blasting device 50 is as follows.

[0040] First, as shown in Figure 1(b), the protrusions P are placed inside the jet diffusion member 10, and the jet diffusion member 10 and the sealing material 73 are pressed against the surface F to be treated. In this state, abrasive material M is sprayed from the spray nozzle 61 of the blasting device 50, and the abrasive material M flows into the internal space from the base end opening 22 of the jig body 20. At the same time, the dust collector is operated.

[0041] As a result, most of the abrasive material M in the hollow portion of the jig body 20 collides with the inner surface of the side wall 23 and the blade-shaped members 24, as shown in Figure 4(a). As described above, the abrasive material M that has collided is irregularly dispersed in various directions, from the direction toward the tip opening 21 (the direction perpendicular to the surface F to be treated) to directions intersecting this direction or perpendicular to this direction.

[0042] As a result, the dispersed abrasive M collides not only with the top surface of the protrusion P surrounded by the jig body 20 but also with the side surfaces and fine parts, allowing for efficient surface treatment of the entire outer surface of the protrusion P. At this time, dust S generated by the collision of the abrasive M with the treatment target surface F and the protrusion P is collected by the suction force of the dust collector from the collection port 30 through the collection flow path 90 and into the collection hose 80, as shown in Figure 1(b).

[0043] Such suction force of the dust collector acts on the abrasive M before it collides with the surface to be treated F or the protrusion P, and the abrasive M may be drawn in a direction toward the recovery port 30 close to the recovery hose 80. In this case, even though the abrasive M is diffused by the injectant diffusion member 10, the abrasive M may not collide with the side of the protrusion P facing the recovery hose 80.

[0044] 4(b), the blasting device 50 is rotated or swung about its axis while the tip end 71 of the nozzle head 70 faces the surface F to be treated. In this way, the jet diffusion member 10 also rotates or swung about its axis, so that the abrasive M is reliably collided with the entire outer surface of the protrusion P, thereby completing the surface treatment operation.

[0045] This eliminates the need to repeatedly change the spray direction of the abrasive M by changing the position or orientation of the nozzle head 70, as was done in the past, to treat the side surfaces of the protrusions P. It also eliminates the need to perform an additional open blasting operation as a separate task, in which the abrasive is collided with the surface to be treated without using a blast cup or the like, in order to collide the abrasive with the protrusions P from the side.

[0046] As described above, by adopting the surface treatment device 100 in which the jet diffusion member 10 is attached to the blasting device 50, it is possible to improve the workability of construction work including surface treatment work and shorten the construction period, while uniformly surface treating the treatment target surface F including the protrusion portion P and ensuring high quality in the finished product after surface treatment.

[0047] Furthermore, the height and diameter of the tip opening 21 of the jig body 20 constituting the jet diffusion member 10 can be changed as appropriate depending on the height, size, shape, etc. of the protrusions P present on the surface to be treated F. This allows the abrasive M to be collided evenly and efficiently against the entire outer surface (top and side surfaces) of the protrusions P, regardless of the shape of the protrusions P present on the surface to be treated F.

[0048] It is advisable to prepare in advance as attachments various shapes of the jet diffusion members 10, each with a different height for the jig body 20 and a different diameter for the tip opening 21. In this way, it is possible to select an appropriate size of the jet diffusion member 10 for the protrusion P at the construction site and attach it to the blasting device 50. This makes it possible to carry out the grinding work of the treatment target surface F where the protrusion P exists quickly and with high construction accuracy.

[0049] The jet diffusion member 10, the surface treatment device 100 and the surface treatment method of the present invention are not limited to the above-described embodiment, and various modifications are possible within the scope of the present invention.

[0050] For example, in this embodiment, blade-shaped members 24 as shown in Fig. 2(b) are used as the uneven portion provided on the inner surface of the side wall 23 of the jig body 20. However, any uneven portion may be used as long as it can irregularly disrupt the spray direction of the abrasive M from the direction toward the tip opening 21 to a direction intersecting or perpendicular to that direction. For example, as shown in Fig. 5(a), spiral unevenness 241 may be formed on the inner surface of the side wall 23, or as shown in Fig. 5(b), the inner surface of the side wall 23 may be formed into a rough surface 242 by, for example, embossing.

[0051] When the uneven portion is formed into a spiral unevenness 241, the direction of the abrasive M that collides with it is irregularly distorted, but most of it is given a regularity according to the direction of the spiral, so that the direction of diffusion of the abrasive M can be controlled.

[0052] 2(a) and 2(b), the jig body 20 of the jet diffusion member 10 is formed in a truncated cone shape, but the present invention is not limited to this. For example, the jig body 20 may be formed in a polygonal truncated pyramid shape, or the side wall 23 may be formed in a truncated cone shape having a corrugated waveform.

[0053] 6(a) and 6(b), the jet diffusion member 10 may have a shape in which a skirt portion 40 is connected to the jig body 20. The skirt portion 40 is a cylindrical body having the same diameter as the tip opening 21 of the jig body 20, and is provided with a recovery port 30 instead of the jig body 20. This can accommodate cases in which the protrusion P is tall, and allows the abrasive M to collide with the entire side surface of the protrusion P. [Explanation of symbols]

[0054] 100 Surface Treatment Equipment 10. Jet diffusion element 20 Jig body 21 Tip opening 22 Proximal opening 23 Side wall 24 Wing-shaped member (concave and convex part) 241 Spiral unevenness (uneven part) 242 Rough surface (uneven part) 30 Collection port (notch) 40 Skirt Section 50 Blasting equipment (surface treatment mechanism) 60 Blast Hose 61 Injection nozzle 70 nozzle head 71 Tip side 72 Recovery Department 73 Sealing material 74 Inner cylinder 741 Base end 742 Tip side 743 Through Hole 80 Recovery hose 90 Recovery channel M Abrasive (jet) S dust P protrusion F Processing surface

Claims

1. A jet diffusion member that diffuses jets, a frustum-shaped jig body having a base end opening into which the jet of material flows and a tip end opening facing the surface to be treated that has a smaller diameter than the base end opening, A jet diffusing member characterized in that an uneven portion is formed on the inner surface of the jig body.

2. 2. The jet diffusion member according to claim 1, The jet diffusion member, wherein the uneven portion is formed by providing a plurality of blade-shaped members extending from the base end opening to the tip end opening of the jig body.

3. 2. The jet diffusion member according to claim 1, A jet diffusing member characterized in that the jet is an abrasive material.

4. The jet diffusion member according to claim 1; a surface treatment mechanism that sprays a spray material toward a surface to be treated; A surface treatment device comprising: the surface treatment mechanism includes an inner cylinder into which an injection nozzle for injecting the injection substance is inserted at a base end thereof, and a nozzle head covering the inner cylinder, The surface treatment device is characterized in that the jet diffusion member is detachably provided on the tip side of the inner cylinder facing the surface to be treated.

5. The surface treatment device according to claim 4, The surface treatment device, wherein the surface treatment mechanism is a blasting device.

6. A surface treatment method using the surface treatment device according to claim 4 or 5, The tip opening of the spray diffusion member is brought into contact with the surface to be treated, with the protrusions positioned on the surface to be treated disposed on the inner side of the spray diffusion member, A surface treatment method comprising spraying the spray material.

7. The surface treatment method according to claim 6, A surface treatment method characterized in that the abrasive is sprayed onto the surface to be treated while rotating the spray diffusion member about an axis thereof.

Images